Screw-machine.



No. 870,499. PATENTBD. NOV. 5, 19-07.

J. ENGLISH.

SCREW MACHINE. APPLICATION FILED 12.215, 1907.

No. 870,499. PATENTED NOV. 5, 1907,

J. ENGLISH.

"SCREW MACHINE. APPLICATION FILED MAR. 25. 1907.

1H: "cams PETERS can, waswmcuv N0. 8'70,499. PATENTED NOV. 5, 1907.

J. ENGLISH.

SCREW MACHINE, ABPLIOATION FILED MAR. 25, 1907 a SHEETS-SHEET a.

THE NORRIS PETERS co, WASHINGTOPL n c.

, UNITED STATESWPATENT OFFICE.

JAMES ENGLISH, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO REYNOLDS & 00., OFNEW HAVEN, CONNECTICUT, A CORPORATION.

SOB/E W-MACHINE Specification of Letters Patent.

Patented Nov. 5, 1907'.

Application filed March 25. 1907. Serial No. 364.488.

T 0 all whom it may concern:

Be it known that I, J AMES ENGLISH, a citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented a new and useful Improvement inScrew-Machines; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure 1 a side view of a screw machine constructed in accordance withmy invention. Fig. 2 a top or plan View of the same, the drivingmechanism which is'of substantially usual construction being omitted.Fig. 3 a face view of the cutter-head. Fig. 4 a side view looking to theright of Fig. 3. Fig. 5 a side view looking to the left of Fig. 3. Fig.6 a plan view of the cutter. Fig. 7 a side view of the end of the stockafter the breaking-down cutter has completed its operation. Fig. 8 aside view of the same after the finishing cutter has completed itsoperation. Fig. 9 a side view of a screw as completed.

This invention relates to an improvement in machines for making screws,and while capable of making screws of various styles is particularlyintended for machine screws such as are formed from stock correspondingin cross-section to the form of the head. In the usual manufacture ofscrews the stock is first broken down or trimmed by a cutter mounted inone head making a rounding out so that when it completes its operation acertain amount of stock is left beneath the head. The blank is thenfinished by a finishing cutter mounted in a second head, which finishingcutter makes a square cut and removes the stock beneath the head so asto form a shoulder between the head and shank, the blank being thenthreaded by a threading die carried by another head. Thus three separateand independent operations are required.

The object of this invention is to construct a head which shall, carry abreaking down or reducing cutter and a finishing cutter which, after thebreaking down or reducing cutter has completed its operation, willadvance to finish the shank portion of the screw and the under face ofthe head, performing these two operations substantially simultaneously;that is, the two cutters will advance with the finishing cutter slightlyin rear of the breaking-down cutter, and when the breaking-down cutterhas reached the limit of its movement, the finishing cutter may advanceto a point slightly in advance of the breaking-down cutter so as tocomplete the formation of the shank of the screw and finish the underface of the head so that the blank is ready to be threaded by a diecarried in the same machine; and the invention consists in theconstruction hereinafter described and particularly recited in theclaims.

The construction of the machine will be best understood by a descriptionof the various steps in the opera tion of forming a completed screw.

The stock 2 is fed into the .machine through a chuck 3 in which it isgripped, the stock being fed at predetermined intervals and inpredetermined lengths, the chuck being revolved through a pinion 4drivenby a similar pinion 5 mounted on a driving shaft 6, allsubstantially as in the usual form of screw machines. The projectingportion 7 of the stock is in line with a cutter head 8 which is mountedupon a hollow shaft 9. L0- cated in an undercut groove 10 in the face ofthe head 8 is a breaking-down or reducing cutter 11 adjustable by meansof a set screw 12. Beneath the reducing cutter 1.1 is a backing block 13on which the blank 7 may rest and be supported. In one side of the headis an undercut groove 14 in which a longitudinally movableslide 15 ismounted, and in this slide is a transversely arranged finishing cutter16 held and adjusted by a set screw 17, the cutting portion of thefinishing cutter 16 being slightly in rear of the cutting portion of thereducing cutter 11. This slide 15 while moved forward by the head 8, maybe moved independent of it, and

is formed at its rear end with an inwardly extending lug 18, and theslide is connected with the head by springs 1.9 and 20.

The hollow shaft 9 on which the head is mounted extends rearward throughbearings 21 and 22 which are fixed to a transversely movable bed 23mounted upon a longitudinally sliding bed 24 which slides on a main bed28; and on the rear end of the tubular shaft is a flanged collar 25which flange enters a notch 26 in a block 27 secured to the sliding bed24 having a depending stud 29. The slide 15 in the head 8 is attached tothe threaded end 30 of a shaft 31 which extends through the hollow shaft9 and projects beyond it at the rear. Mounted upon the sliding bed 24isa block 32 in which a headed screw 33 is mounted in position to engagewith the rear end of the shaft 31, but normally out of engagementtherewith. This block 32 is connected with the block 27 bya spring 34and has a depending stud 35 which extends down through the sliding bed24 and bed 28 so that it can be moved independently of both. Below thebed 28 which is supported by legs 36 is a large cam wheel 37 having acam rib 38 adapted to engage with the stud 29 so as to move the slidingbed 24 and with a cam rib 39 adapted to engage with the stud 35 so as tomove the block 32. This cam wheel 37'is mounted on a shaft 40 on whichis fixed a large gear wheel 41 which meshes with a pinion 42 on a shaft43 driven by a belt pulley 44, the pulley 44 being free to turn upon theshaft 43 but thrown into engagement therewith by a clutch145 on theshaft43, the clutch being thrown through a link 46 connected with one arm 47of a bell-crank lever, the other arm 48 of which is connected by aconnecting rod 49 with a small hand cam lever 50 mounted upon the bed ofthe machine. Thus the head 8 with its slide 15 may be moved forward andafter the head has reached a predetermined point the cam 39 will engagewith the stud 35 of the block 32, moving that block forward upon thesliding bed 24 and against the shaft 31 forcing the slide 15 forcut.

Ward and the finishing cutter 16 slightly beyond the cutter 11, so thatthe finishing cutter l6 advances to finish the shank of the screw andthe under face ofthe head, the breaking down or reducing cutter 11making a round out, while the finishing cutter makes a square Afterthese two cutting operations have been performed, the sliding bed 24 isretired, drawing the head 8 with it, the slide returning to its normalposition under the action of the springs 19 and 20 which have beenextended by the forward movement of the slide.

Mounted in bearings 51, 52, arranged side by side With-the bearings 21and 22, is a shaft 53 carrying a screw threading die 54. At one side thetransversely movable bed 23 is connected with a lever 55 and at theopposite side with a lever 56, these levers being engaged respectivelyby cams 58 mounted on a cam wheel 59 also mounted on'the shaft 40 and soas to move the transversely movable bed from side to side so that afterthe blank has been reduced andfinished, the threading die 54 will bebrought into line with it. When this sliding bed has thus been moved tobring the threading die in line with the blank, the rearwardly extendingend 60 of the shaft 53 comes into line with the screw 33 in the block32, and by means of suitable cams 61 on the cam wheel 37 the block willagain be moved forward so as to force the cutting die 54 onto the blank,and the extent of movement depends upon the extent to which the blank isto be threaded, the operating movement of the threading-die beingregulated by a stem 69 which is longitudinally adjustable and with whicha lug 70 on the threading die engages. When the lug passes beyond thestem 69 the die will be free to revolve with the screw being cut.

In order to hold the transversely movable bed 23 in proper position soas to present the head 8 or the threading die 54 to the blank, avertically movable pin 71 is arranged below the bed of the machine andadapted to lock the transversely movable slide therewith, this pin beingmounted in one end of a lever 72 which lever is turned by a cam and thepin normally forced upward by a spring 74. After the blank has thus beenbroken down, finished and threaded, it is severed from the strip ofstock 2 by means of cutters arranged in the usual way of screw machines.It will thus be seen that stock is broken down or reduced, finished andthreaded at practically two operations, thereby reducing the number ofparts in a screw machine and simplifying. the operation.

I claim 1. A screw machine comprising a head, a breaking-down cuttermounted therein, a slide arranged in one side of said head, a finishingcutter mounted in said slide, and means for advancing said head andslide, and means for advancing, said slide beyond said head,substantially as described.

2. Ina screw machine, a head carrying a breaking-down cutter, a slidemounted in said head and carrying a finishing cutter, springs connectingsaid slide and head and tending to keep the finishing cutter in rear ofthe reducing cutter, means for advancing said head and slide, and meansfor advancing the slide beyond said head, substantially as described. 1

3. In a screw machine, a head mounted upon a hollow shaft, abreaking-down cutter mounted in said head, a slide arranged in one sideof said head, a finishing cutter mounted in said slide, said slideconnected with a shaft extending through the said hollow shaft, meansfor moving said shafts to advance said head and slide together, and foradvancing said slide independent of the head, substantially asdescribed.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

JAMES ENGLISH. Witnesses FREDERIC C. EARLE, CLARA L. WEED.

